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/******************************************************************************

*                                                                             *

* License Agreement                                                           *

*                                                                             *

* Copyright (c) 2009      Altera Corporation, San Jose, California, USA.      *

* All rights reserved.                                                        *

*                                                                             *

* Permission is hereby granted, free of charge, to any person obtaining a     *

* copy of this software and associated documentation files (the "Software"),  *

* to deal in the Software without restriction, including without limitation   *

* the rights to use, copy, modify, merge, publish, distribute, sublicense,    *

* and/or sell copies of the Software, and to permit persons to whom the       *

* Software is furnished to do so, subject to the following conditions:        *

*                                                                             *

* The above copyright notice and this permission notice shall be included in  *

* all copies or substantial portions of the Software.                         *

*                                                                             *

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR  *

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,    *

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE *

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER      *

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING     *

* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER         *

* DEALINGS IN THE SOFTWARE.                                                   *

*                                                                             *

* This agreement shall be governed in all respects by the laws of the State   *

* of California and by the laws of the United States of America.              *

*                                                                             *

* Altera does not recommend, suggest or require that this reference design    *

* file be used in conjunction or combination with any other product.          *

******************************************************************************/

#include <errno.h>

#include "system.h"

/*

 * Provides an interrupt registry mechanism for the any CPUs internal interrupt

 * controller (IIC) when the enhanced interrupt API is active.

 */

#ifndef ALT_CPU_EIC_PRESENT

#ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT

#include "alt_types.h"

#include "sys/alt_irq.h"

#include "priv/alt_iic_isr_register.h"

/*

 * The header, alt_irq_entry.h, contains the exception entry point, and is

 * provided by the processor component. It is included here, so that the code

 * will be added to the executable only if alt_irq_register() is present, i.e.

 * if no interrupts are registered - there's no need to provide any

 * interrupt handling.

 */

#include "sys/alt_irq_entry.h"

/*

 * The header, alt_irq_table.h contains a table describing which function

 * handles each interrupt.

 */

#include "priv/alt_irq_table.h"

/** @Function Description:  This function registers an interrupt handler.

  * If the function is succesful, then the requested interrupt will be enabled

  * upon return. Registering a NULL handler will disable the interrupt.

  *

  * @API Type:              External

  * @param ic_id            Interrupt controller ID

  * @param irq              IRQ ID number

  * @param isr              Pointer to interrupt service routine

  * @param isr_context      Opaque pointer passed to ISR

  * @param flags

  * @return                 0 if successful, else error (-1)

  */

int alt_iic_isr_register(alt_u32 ic_id, alt_u32 irq, alt_isr_func isr,

  void *isr_context, void *flags)

{

  int rc = -EINVAL;

  int id = irq;             /* IRQ interpreted as the interrupt ID. */

  alt_irq_context status;

  if (id < ALT_NIRQ)

  {

    /*

     * interrupts are disabled while the handler tables are updated to ensure

     * that an interrupt doesn't occur while the tables are in an inconsistant

     * state.

     */

    status = alt_irq_disable_all();

    alt_irq[id].handler = isr;

    alt_irq[id].context = isr_context;

    rc = (isr) ? alt_ic_irq_enable(ic_id, id) : alt_ic_irq_disable(ic_id, id);

    alt_irq_enable_all(status);

  }

  return rc;

}

#endif /* ALT_ENHANCED_INTERRUPT_API_PRESENT */

#endif /* ALT_CPU_EIC_PRESENT */